Green is probably the most common among unusual poop colors. It is mainly a consequence of certain food consummation, such as vegetables which are rich in iron and in this case isn't really worrying. However, green feces can also be caused by other factors which might be reason enough to visit your doctor.

Consistency of black poop is usually tarry and it almost always has a strong odor. It is usually caused by one's diet, but not necessarily. Lack of food rich in fiber can increase the possibility of black stool, but other factors such as hormonal disorders and diseases of the digestive system can cause it too.

Red feces is not a common occurrence, but it does happen to some individuals. It is primarily caused by rectal bleeding, which refers to the passage of blood mixed with stool through the anus. Rectal bleeding can be caused by a variety of factors such as hemmorhoids, anal fissures and tumors.

Orange poop is mostly a result of consuming food rich in beta carotene and industrial dyes. These include fruits and vegetables such as carrots, kale, mangoes, pumpkin, but also some preserved items like soft drinks, jellies and other similar items that contain artificial dyes.

White feces is usually an alarming sign that something isn't functioning properly in one's digestive system. The first suspicion is the liver, which plays a major role in making the stool color darker. Medications can make the poop turn white as well, although rarely. Consulting with your doctor is recommended in any case.

Blue feces is usually caused by consumption of food which contains blue artificial colors, but also fruits such as blueberries. Blue stool is relatively common in babies as a direct result of baby formulas which contain blue dyes. In most cases, there's no room for panic, as the symptoms fade quickly.